In the tumultuous two weeks surrounding Zimbabwe's presidential election --the country's first since the ouster of longtime strongman Robert Mugabe --opposition leader Nelson Chamisa has made no secret of what he thinks of its results. Describing them as "unverified," "inflated" and outright "fake," Chamisa has repeatedly rejected the formal tally that handed a victory to President Emmerson Mnangagwa. Now, Chamisa's party has made his objections official. The Movement for Democratic Change filed a legal challenge to the election results Friday, with just minutes to spare before its deadline to do so — and with three days to go before Mnangagwa's previously scheduled inauguration. The party's lawyers allege widespread voting irregularities and have...